On 24 and 25 September 1994 Dr. Peter Black took a remarkable
set of slides in Eastern Pacific Hurricane Olivia. On the 24th
Olvia's central pressure was steady at 949 hPa and the maximum
flight-level winds were 120 kt. On the 25th the storm had intensified
to 925 hPa, but the sea-level pressure rose by more than 10 hPa
during the 4 h that the P-3s were there. The storm moved from
WNW 16N 118W on the 24th to 19N 120W on the 25th. These images
illustrate important aspects of tropical-cyclone eye dynamics:
- View of Olivia's eyewall
with the P-3's wing in the foreground.
convective rolls probably due to barotropic instability
along the inner edge of the eyewall wind maximum.
due to moisture detrained from the eyewall cascading down the
inner edge of the eye.
- Low clouds in Olivia's eye on
showing the sea surface visible through breaks
in the undercast.
- Low clouds in the eye on
showing the unbroken overcast due to moistening of the
eye as Olivia filled.
of Olivia's eyewall on 24 September.
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